Fuel pump adjustor



May 6, 1947. w. J. CHILCOTT FUEL PUMP ADJUSTER Filed Jan. 12, 1946 INVENTOR. WILLIAM J. CmLco'rT Patented May 6, 1947 UNITED STATES PATENT OFFICE FUEL PUMP ADJUSTOR William J. Chllcott, Wichita, Kans. Application January 12, 1946, Serial No. 640,943

3 Claims. 1

My invention relates to a fuel pump adjustor. and has for its principal object to vary the fuel intake normally provided in the construction and assembly of a conventional fuel pump for internal combustion engines.

A further object of my invention is to control fuel consumption for best result .while the engine is in action.

A still further object of my invention is to provide a means to control the stroke of the fuel pump lever, the adaptability of the means being to permit raising or lowering of the pump which in turn will vary the stroke of the lever in one direction, said direction of movement of the lever being to draw fuel into said pump, while the exhaust of the fuel from the pump is actuated by the normal arrangement for the rocking movement of the lever to eject the fuel to a carburetor, and being actuated through the medium of a spring originally provided in the pump.

A still further object of my invention is to construct an element hereinafter referred to as an adaptor as an accessory, or a device to be applied in the manufacturing and installation of fuel pumps.

A still further object: of my invention is to construct an inexpensive adaptor to be applied without altering the pump, or the element to which it is attached. The simplicity and efficiency of its service apparently should become indispensable and should be installed at the time of manufacturing an automobile, or the like, that relies upon the internal combustion of gaseous fuel for its motive power.

A still further object of my invention is to provide an adapter that is not injurious to the working parts provided in a conventional pump, but rather to eliminate excess strain of the stroke of the pumping mechanism as well as to adjust for excess wear that may occur under normal running conditions of the motor, and furthermore to prolong the efliciency of the pump, and also the pump being adjusted to its required efficiency, the same will have sufficient pressure to eliminate vapor lock of the fuel in the pump, which otherwise may occur by a low fuel pump pressure not being capable of overcoming the presence or air or gaseous condition.

These and other objects will hereinafter be more fully explained, reference being had to the accompanying drawing forming a part of this specification, and in which like characters will apply to like parts in the different views.

Referrii 3 to the drawing:

Fig. 1 is a side elevation of the adapter as applied to a conventional fuel pump and an oil filling tube of a motor.

Fig. 2 is an elevation of the adapter.

Fig. 3 is a cross sectional view taken on line 3-3 in Fig. 1.

Fig. 4 is a detailed sectional view to illustrate the carrying bolt for the pump to the oil filling tube, and position of the adapter, the bolt being altered to illustrate adjusting play for the pump.

Fig. 5 is a modification that will substitute the bolt as illustrated in Fig. 4.

As a more concised description of the drawing, it will first be seen that the invention is applied to a connection for a conventional fuel pump chamber l to an oil filling tube 2, the latter being connected to an internal combustion engine 3, and said fuel pump showing fragmentarily the intake and exhaust pipes l and 5, respectively. Furthermore, a flexible diaphragm 6 of the fuel pump is actuated by a lever comprisme two members I and 8 that are rule-back jointed near the longitudinal center of the lever as a whole, at which point, the lever is rcckably mounted by a pin 9 that engages through the joint, and a component I of the pump, later deits upper end secured to the diaphragm at its' diametrical axis while the other end thereof is rockably connected on the lever portion 8 adjacent its outer end. It will be understood that the plunger extends through the coil spring 8' for alternate co-action, to flex the diaphragm, said spring 8' having its upper end in contact with the diaphragm while its lower end is stationarily supported in spaced relation above the lever to function as a flexible hoist for the upward movement of the diaphragm, while the function or the plunger is means to retract the diaphragm by force to inject fuel gas into the pump, the spring 8 to eject the fuel as required by the engine, as the lever portion 8' becomes inactive but free to respond with the expansion of the spring. It will be seen that spring I is means to tension the other member I of the lever to snug engagement with the upper end of a push rod II that is cam actuated in a conventional way during action of the engine. It will now be understood that the cam action on its respective end portion 1 of the lever will energize the other member 8 at intervals subject to the fuel consumption from the pump that will vary its stroke, and in order to vary the pump action with respect to a greateror lesser amount of fuel as required, is through the medium of raising or lowering the pump structure which heretofore was not provided.

To overcome such deficiency as above described I have provided, through the medium of my invention, that is adapted to move and determine the position of the pump. This I accomplish by a structure U-shaped in form and consisting of a pair of legs l2, spaced apart and being connected at one pair of corresponding ends by a crotch i3 while the other ends of the legs are bored as at A to receive bolts i4 insertible therethrough as an unchangeable support when the U-shaped member is installed as later described. Extending at right angle from the upper or crotch connected ends is a lip l5 longitudinal with the crotch, the ends terminating a spaced distance inward from the outer edges of the legs, said lip being bored and threaded at its longitudinal and transverse centers, through which a threaded screw it will engage, the screw being secured at a desired downward movement of the pump by a lock nut ll placed upon the upper side of the lip to lock the screw in a fixed position, said screw having a slotted head to turn the same by a screwdriver, or the like, it being understood that the bolts l4 being loosened for the above mentioned adjustment, and then tightened.

Said adaptor being bored through its legs as heretofore stated is means to insert the same between flange I! of the pump and the head of the bolts II, it being understood that the bore A of the legs are equal in diameter to the threaded portion of the bolts, equal to the bores through the flange, and equal to the threaded bore in the wall of the oil filling tube 2 as shown in Fig. 4 the filling tube th'readedly receiving the bolts as carrying means for said adapter on said tube in associated fixed relation thereto.

The invention also includes remodeling of the bolt I by reducing the same in diameter for an intermediate portion of its length, said reduced portion being aligned with the bore of the pump flange, so that the same may be raised or lowered by loosening the bolts and when to a desired position the bolts are tightened as above stated. The adjustment being so arranged, the rocking point of the lever may be raised or lowered from the fixed upward stroke of the push rod at its upper extremity, as the diameter of the bolts where reduced provides ample play in either direction as will be seen in Fig. 4. Should the pump be raised, the lever portions are free to rock independently as portion I at all times will be rocked downward to seat on the end of the push rod by tension of spring 'I', in which position, the ruleback joint B is open which provides a lost motion that shortens th downward stroke of lever. portion 8, in which case, the intake of the pump is reduced, and vice-versa when the pump is moved downwardly in its adjustment, the ruleback joint as at B may be closed prior to the upward movement of portion 1, in which instance, the movement of portion 1 will rock lever portion I for a full stroke thereof thus increasing the intakeof fuel to the pump.

An eiiicient means to lower the pump in its adiustment thereof to increase the intake of fuel is through the medium of screwing downwardly the screw it, the lower end of which has its bearing on the flange of the pump neck I, it being understood that the bolts ll are first loosened sumciently to permitfree sliding movement ofthe pump as the adapter and oil filling tube are fixed while the pump is being moved to a desired point, after which the pump and adapter are rigidly secured by tightening the bolts II, and .vice-versa by loosening the bolts II, as above described the pump may be raised after the screw i6 has been turned anticlockwise, and in either predetermined position the screw is locked by its nut ii to bind the same against rotation as the nut rigidly engages on the lip of the adapter. v For example to maintain a reduced pressure in the pump chamber, the stroke of the lever portion 8 is shortened by raising the pump suiiicient to open the spaces between the contactible portions 1 and 8 at the rule-back joint which is assured by tensioning the lever portion 1 downward through the medium of its spring I, and the ruleback joint being opened provides a partial lost motion of the lever portion 1, and when the joint is closed, the remaining movement of the push rod will actuate lever portion 8 under a reduced length of stroke .to avoid over pressure in the pump chamber, and at the same time to provide a suillcient amount of time for spring I to flex the diaphragm inward as ejecting means for the fluid to its place of consumption, therefor a uniform pressure of ejection is maintained for an engine that will combust a lesser amount of fuel per mileage for its action, while on the other hand, by lowering the pump the rule-back joint of the lever may be nearly closed and the stroke from the push rod will extend the stroke of the intake lever portion 8 for a greater supply of fuel that may be ejected accordingly as. above described, and in this instance for an engine requiring more gas per mileage it is increased. The vertical adjustment of the pump is not made exclusively to increase the fuel to an engine whose efiiciency is below par but also to adjust for overcoming deficiencies that may exist in the pump itself.

To cause an exact vertical movement of the fuel pump it will be seen in Fig. 3 that the neck as'carrying means for the pump chamber fits slidably between the legs of the adapter sumcient to avoid lateral rocking movement of the pump from its vertical axis, otherwise, disalignment of the lever with respect to the push rod may occur during adjustment of the pump, or during its action over a period of time.

In Fig. 5 is disclosed a modification of the bolt that may be substituted by a threaded stud ll having an eye in one end to'turn the same by a screwdriver and locked by'a nut i! engaging firmly in contact with the side legs of the adapter. Another feature of the modification is to reduce the diameter of the stud body intermediate of its end portions by eccentrically positioning the reduced portion whereby the stud may be reversed with respect to its diametrical axis to meet conditions existing in diflerent motors and their respective pumps, and such other modifications may be made as lie within the scope of the appended claims.

Patent is:

Having fully described my invention what I claim as new, and desire to secure by letters in diameter intermediate their ends to loosely engage in an aperture extending through said flange as means to permit vertical adjustment of the fuel pump when the bolts are loosened, and means on the crotch for vertical movement of the pump to a desired position, the bolts when tightened snugly bind the member and flange to the oil tube whereby a predetermined stroke for the fuel pumps lever may be attained to regulate a suitable supply of fuel through the pump.

2. In a fuel pump adjuster of the class described comprising in combination a fuel pump and an internal combustion engine, said pump having an apertured flange and a neck to connect the flange to the pump, and an oil filling tube carried by the engine, bolts to connect the flange to the oil tube, a U-shaped member comprising a pair of legs to straddle the neck, the legs at their free ends being bored to flt closely on the bolts between their heads and the flange of the neck, the other ends of the legs being connected by a lipped crotch member, the lip extending at right angle toward the tube and being centrally bored and threaded, a threaded screw having a lock nut thereon to secure the same against rotation when the pump is selectively set, one end of the threaded screw to engage on the flange as moving means for the pump along a vertical plane when the bolts are loosened, the diameter of the bolts being reduced where they engage in the apertures of the flange to permit vertical movement of the pump to a desired point and then rigidly secured by the bolts.

3. In a fuel pump adjuster of the class de- 6 scribed an internal combustion engine, a flanged fuel pump for said engine, and bolts extending through the flange of the pump to secure the pump to the engine, and an adapter of suitable thickness and bifurcated, the outer ends of the bifurcation being bored to stationarily engage on the bolts, and means at the other ends of the bifurcation to permit vertical movement of the fuel pump to a desired position when the bolts are partially loosened, said bolts co-acting to secure the adapter stationarily in working relation to said engine and said pump and having a portion of their length intermediate their ends reduced where they pass through the flange of the pump to permit sliding movement thereof, and the said bolts then being tightened to rigidly secure the pump and adapter to the internal combustion engine.

WILLIAM J. CHILCO'I'I.

REFERENCES CITED The following references are of record in the flle of this patent:

UNITED STATES PATENTS Schantz Nov. 17, 1914 

